NB
20+ years old is not quite true as there have been numerous software and hardware updates over the years. The software that is on the system now is pretty much what is being sold around the world.
You raise a good point about what you can see, via ADS B, on your phones or tablets. Is a whiz bang system going to be obsolete in 7-8 years? Just putting it out there but you could almost do Enroute ATC using Flightradar 24 (tm) now! Of course Im being a bit facetious but if we tender for a system now at $500M + is it actually going to be relevant in 10 years?
I may seem negative but I think the airlines may get sold a pup. Unless AsA goes to a single centre (and ffs move the sea anchors out of CB) and RAAF consolidates it Approach units there will be no significant staff savings. Anyone who believes there will be great automation bringing about huge staff savings needs to take a cold shower.